audio-gd Stellar product

	Wisdom in mind, enthusiasm at heart.

XA-150 Mono
(Musical style design)
(100W Pure Class A Mono Power Amp)

Real Balanced Diamond Differential Design Pure Class A Mono Power Amp
A Lot K170/J74 Has Been Apply
Uses 4 Transformers (In Total 1700W ) And 180,000 Audio Grade Capacitors
Non-Feedback Output Stages In Total 48 Pc Output Transistors
Separate 8 Groups Pure Class A PSUs Power Supply
100W @ 8 ohm Pure Class A Power
150W @ 8 ohm / 300W@4 ohm / 600W@2 ohm Max Power
Can Custom Order Pure Class A Power As 30W/50W/70W/100W
Soft Start Power Design

Chassis Size: 375*510*273 MM (W*D*H, Every unit)
Pack Weight : 90KG (Two units)
Power Consumed：700W (Two units, 100W pure class A state .)
Gain：28DB
Some RIFA caps are the used but with warranty

Price :USD4180 (Two Units)(Exclusive the shipping cost)

Stereo  needs   two units.

History of the Diamond Differential design :

At July 2004, I registered the brand audio-gd , at September 2004, I published the first generation diamond difference design at the < Radio & TV> , the best popular audio technology magazine in China . There were a lot DIYer call me even writed letters to me discuss the circuit.	At November 2004 , the fist regular product of audio-gd , XA-100 power amp released. It had the good honor from customers , let audio-gd can stand and grow up. Before this amp, I already have 6 years experiences of built the Diamond Difference circuit .	At 2005, the first regular DAC product DAC-1 released, a TDA1541A with diamond difference output stages.

At 2006 ,the RT-1 released , its sound adjusted based on a 300B tube amp.	At 2007 , the RT3 kit released for DIYers .	At 2008 , the DAC-3 released, built in 4 pcs PCM1704 with diamond difference design .

At 2009 ,the SA-300 balanced amp released .	At 2010, I design the dual TDA1541AS2 DAC for fun, we only sale 5 units to the return customers . A pair TDA1541AS2 now value USD800 in market .	At 2011 is the Reference 8 and 9 released .

Some other products applied Diamond Difference design maybe can't list , like the C-2 SA, ROC-SA, SA-100.
　

XA-150 usual output power THD+Noise test :

THD+N at output 5W @ 8 ohm load ：

THD+N at output 10W @ 8 ohm load ：

THD+N at output 20W @ 8 ohm load ：

Noise output level 0.25mV:

　